linux-kernel - Re: [RFC V2 PATCH 01/11] cxl/mbox: Add debug of hardware error code

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Date:   Fri, 14 Oct 2022 09:29:21 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     ira.weiny@...el.com
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org
Subject: Re: [RFC V2 PATCH 01/11] cxl/mbox: Add debug of hardware error code

On Mon, 10 Oct 2022, ira.weiny@...el.com wrote:

>From: Ira Weiny <ira.weiny@...el.com>
>
>If a mailbox command fails the driver always reports ENXIO.  But this
>may not be enough information to understand why the hardware, or in my
>case Qemu, was failing.
>
>Add a debug print of the error code returned from the hardware.

Reviewed-by: Davidlohr Bueso <dave@...olabs.net>

with a nit below.

>
>Signed-off-by: Ira Weiny <ira.weiny@...el.com>
>---
> drivers/cxl/core/mbox.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
>index 16176b9278b4..6c4d024ad0e8 100644
>--- a/drivers/cxl/core/mbox.c
>+++ b/drivers/cxl/core/mbox.c
>@@ -181,8 +181,11 @@ int cxl_mbox_send_cmd(struct cxl_dev_state *cxlds, u16 opcode, void *in,
>	if (rc)
>		return rc;
>
>-	if (mbox_cmd.return_code != CXL_MBOX_CMD_RC_SUCCESS)
>+	if (mbox_cmd.return_code != CXL_MBOX_CMD_RC_SUCCESS) {
>+		dev_dbg(cxlds->dev, "MB error : %s\n",

Maybe s/MB/mbox?

>+			cxl_mbox_cmd_rc2str(&mbox_cmd));
>		return cxl_mbox_cmd_rc2errno(&mbox_cmd);
>+	}
>
>	/*
>	 * Variable sized commands can't be validated and so it's up to the
>--
>2.37.2
>